ext4: validate external journal superblock checksum
If the external journal device has metadata_csum enabled, verify that the superblock checksum matches the block before we try to mount. Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Reviewed-by: Jan Kara <jack@suse.cz> Signed-off-by: Theodore Ts'o <tytso@mit.edu>
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@ -4414,6 +4414,15 @@ static journal_t *ext4_get_dev_journal(struct super_block *sb,
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goto out_bdev;
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}
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if ((le32_to_cpu(es->s_feature_ro_compat) &
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EXT4_FEATURE_RO_COMPAT_METADATA_CSUM) &&
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es->s_checksum != ext4_superblock_csum(sb, es)) {
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ext4_msg(sb, KERN_ERR, "external journal has "
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"corrupt superblock");
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brelse(bh);
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goto out_bdev;
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}
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if (memcmp(EXT4_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
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ext4_msg(sb, KERN_ERR, "journal UUID does not match");
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brelse(bh);
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